Center for Polymers and Organic Solids, University of California, Santa Barbara, California 93106, USA.
Adv Mater. 2012 May 2;24(17):2273-7. doi: 10.1002/adma.201104192. Epub 2012 Mar 26.
The transport and relaxation of photogenerated carriers in a bulk heterojunction (BHJ) material made of a blend of PCDTBT and PC(60) BM are studied as a function of the concentration of PC(84)BM impurities. For low concentrations of PC(84)BM, the increasing activation energy with delay time indicates transport dominated by trap-limited carrier drift while the photocarriers relax through a manifold of disorder-induced localized states near the band edge. In the BHJ material with high concentration of PC(84)BM, transport is dominated by carrier hopping within the PC(84)BM impurity band.
研究了由 PCDTBT 和 PC(60)BM 共混物制成的体异质结（BHJ）材料中光生载流子的输运和弛豫与 PC(84)BM 杂质浓度的关系。对于低浓度的 PC(84)BM，随着延迟时间的增加，激活能增加表明载流子输运主要受陷阱限制的载流子漂移控制，而光生载流子通过能带边缘附近的多个无序诱导局域态弛豫。在高浓度的 PC(84)BM 的 BHJ 材料中，载流子输运主要由 PC(84)BM 杂质带内的载流子跳跃控制。
